The order Euphausiacea is divided into two families, Bentheuphausiidae and Euphausiidae. the first has one species, the second has 85 species. Well known species are the Antarctic krill (Euphausia superba), Pacific krill (Euphausia pacifica) and Northern krill (Meganyctiphanes norvegica).

↑O. Shimomura (1995). "The roles of the two highly unstable components F and P involved in the bioluminescence of euphausiid shrimps". Journal of Bioluminescence and Chemiluminescence10 (2): 91–101. doi:10.1002/bio.1170100205. PMID7676855.